US3884122A - Metal-cutting machine for machining locating surfaces - Google Patents

Metal-cutting machine for machining locating surfaces Download PDF

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Publication number
US3884122A
US3884122A US304825A US30482572A US3884122A US 3884122 A US3884122 A US 3884122A US 304825 A US304825 A US 304825A US 30482572 A US30482572 A US 30482572A US 3884122 A US3884122 A US 3884122A
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United States
Prior art keywords
base
cutting
course
respect
beams
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US304825A
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English (en)
Inventor
Evgeny Alexandrovich Chernov
Arkady Nikolaevich Poletaev
Saul Vulfovich Golod
Evgeny Vasilievich Petrov
Dmitry Timofeevich Vasiliev
Vitold Antonovich Tofpenets
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Individual
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Individual
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Priority to AT892172A priority Critical patent/AT325377B/de
Priority to GB4838872A priority patent/GB1384804A/en
Priority to CH1556472A priority patent/CH574301A5/xx
Priority to DE2252515A priority patent/DE2252515C3/de
Application filed by Individual filed Critical Individual
Priority to US304825A priority patent/US3884122A/en
Priority to FR7244815A priority patent/FR2210483B1/fr
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    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q1/00Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
    • B23Q1/25Movable or adjustable work or tool supports
    • B23Q1/26Movable or adjustable work or tool supports characterised by constructional features relating to the co-operation of relatively movable members; Means for preventing relative movement of such members
    • B23Q1/28Means for securing sliding members in any desired position
    • B23Q1/287Means for securing sliding members in any desired position using a hydraulically controlled membrane acting directly upon a sliding member
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q1/00Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
    • B23Q1/25Movable or adjustable work or tool supports
    • B23Q1/26Movable or adjustable work or tool supports characterised by constructional features relating to the co-operation of relatively movable members; Means for preventing relative movement of such members
    • B23Q1/28Means for securing sliding members in any desired position
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q1/00Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
    • B23Q1/25Movable or adjustable work or tool supports
    • B23Q1/26Movable or adjustable work or tool supports characterised by constructional features relating to the co-operation of relatively movable members; Means for preventing relative movement of such members
    • B23Q1/38Movable or adjustable work or tool supports characterised by constructional features relating to the co-operation of relatively movable members; Means for preventing relative movement of such members using fluid bearings or fluid cushion supports
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q1/00Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
    • B23Q1/25Movable or adjustable work or tool supports
    • B23Q1/44Movable or adjustable work or tool supports using particular mechanisms
    • B23Q1/48Movable or adjustable work or tool supports using particular mechanisms with sliding pairs and rotating pairs
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23QDETAILS, COMPONENTS, OR ACCESSORIES FOR MACHINE TOOLS, e.g. ARRANGEMENTS FOR COPYING OR CONTROLLING; MACHINE TOOLS IN GENERAL CHARACTERISED BY THE CONSTRUCTION OF PARTICULAR DETAILS OR COMPONENTS; COMBINATIONS OR ASSOCIATIONS OF METAL-WORKING MACHINES, NOT DIRECTED TO A PARTICULAR RESULT
    • B23Q1/00Members which are comprised in the general build-up of a form of machine, particularly relatively large fixed members
    • B23Q1/25Movable or adjustable work or tool supports
    • B23Q1/44Movable or adjustable work or tool supports using particular mechanisms
    • B23Q1/50Movable or adjustable work or tool supports using particular mechanisms with rotating pairs only, the rotating pairs being the first two elements of the mechanism
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T408/00Cutting by use of rotating axially moving tool
    • Y10T408/52Cutting by use of rotating axially moving tool with work advancing or guiding means
    • Y10T408/54Means to intermittently advance work
    • Y10T408/545Rotary, work-supporting means
    • YGENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10TTECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T409/00Gear cutting, milling, or planing
    • Y10T409/30Milling
    • Y10T409/304536Milling including means to infeed work to cutter
    • Y10T409/305544Milling including means to infeed work to cutter with work holder
    • Y10T409/305656Milling including means to infeed work to cutter with work holder including means to support work for rotation during operation
    • Y10T409/305768Milling including means to infeed work to cutter with work holder including means to support work for rotation during operation with linear movement of work

Definitions

  • ABSTRACT A table carrying a workpiece being machined, is mounted on a base and has at least two degrees of freedom with respect thereto for an optimum positioning of the workpiece with respect to a cutting tool by way of at least two table orientation mechanisms.
  • a device comprising: an intermediate link floating in the base and adapted for a continuous sliding contact with the table surface facing the base in the course of the table orienting, and a means for a positive locking of said intermediate link simultaneously with the table and with the base during the course of cutting.
  • the present invention relates generally to metalcutting machine-tools and has particular reference to metal-cutting machine-tools for machining locating surfaces.
  • the invention can find most utility when employed for machining locating surfaces of intricately shaped parts, such as turbine blades.
  • prior-art cutting machines for machining locating surfaces comprising a table for setting the workpiece being machined, the table being mounted on a base and having at least two degrees of freedom with respect thereto for effecting an optimum positioning workpiece with respect to the cutting tool by way of at least two table orientation mechanisms (whose number depends upon that of the degrees of freedom thereof), located on the base one upon the other so as to form a consecutive kinematic chain having a terminal link interconnected with the table, and a device for effecting positive table fixing in a predetermined position with respect to the cutting tool.
  • One of the table orientation mechanisms is essentially a movable platform, while the other, a table turning mechanism.
  • Locked in place on the machine base are straight rolling-contact ways carrying a movable platform which bears circular rollingcontact ways, whereon the table turning mechanism is mounted.
  • Each orientation mechanism has its own device for positively fixing the table against the motion the mechanism is to impart thereto.
  • the device for locking the table against translational motion of the platform along the base ways is made as follows.
  • the movable platform has a stepped boring to accommodate the drive shaft.
  • the shaft is rotated by the operator owing to which some difficulties arise in the machine servicing.
  • the shaft carries a pair of clamping jaws of which one is set on a threaded portion of the shaft and the other, on plain portion thereof. The pair ofjaws clamps the protruding web stem when the shaft rotates, thus locking the table against translational motion.
  • the device for locking the table against rotation during the course of cutting is similar in design.
  • each table fixing device of the known machines takes up cutting forces which extend either parallel with the straight ways of the platform or tangential to the circular ways of the table turning mechanism.
  • the construction of the table fixing devices features the total rigidity of the table orientation mechanisms locked against movement (i.e., the rigidity of the table as a whole) decreases with the increase of the degrees of freedom.
  • the known machines cannot be employed for mechanical treatment of workpieces involving high cutting forces, such as in case of milling the locating surfaces of workpieces with large (up to 7 mm) machining allowances.
  • Another disadvantage of the prior-art machine resides in the necessity for the accurate manufacture and playfree fitting of the parts of the table fixing device. For instance, if play is left between the mating surfaces of the drive shaft and the stepped boring in the platform, wherein it is accommodated, a possibility arises for an undesirable platform motion with respect to the base (or of the table with respect to the platform). With the table having numrous degrees of freedom, i.e., when numerous mechanisms for table orienting are involved (practically the table may have six degrees of freedom) the various plays are summed up and adversely affect the orientational accuracy of the workpiece being machined with respect to the cutting tool.
  • the device for effecting a positive locking the table in the predetermined position with respect to the cutting tool incorporates such a number of the table fixing devices that depends upon the number of the degrees of freedom of the table, i.e., that of the table orientation mechanisms.
  • the device for effecting positive table locking in a predetermined position with respect to the cutting tool incorporates an intermediate link floating in the base and which is adapted to be in a continuous sliding contact with the table surface that faces the base during the course of the table orientation with respect to the cutting tool, and including means for a positive connection of the intermediate link to the table and to the base at any time during the course of the cutting process.
  • At least two opposite table sides on the surface facing the base have T- shaped shoulders, while the base is provided with the respective depressions or recesses for the shoulders so as to be freely accommodated therein, adapted to be filled with a medium capable of being during a liquid state in the course of table orientation with respect to the cutting tool, and in a solid state so as to firmly engage the base and at the same time to rigidly embrace the table shoulders during the course of the cutting process.
  • Such a constructional embodiment of the device ensures a high degree of rigidity of the table in the course of cutting at a high accuracy of the table fixing in the predetermined position with respect to the cutting tool.
  • the base be provided with channels located proximate the contour of each said recess and adapted to be alternatively communicated with a source of heat or of cold during the course of the table orientation and during the cutting process, respectively.
  • Such a constructional feature ensures high table rigidity during the course of cutting and, besides, provides for favourable conditions for protection of the table orientation mechanisms against the ingress of dust or cutting emulsion.
  • the portion of the shoulder which faces the bottom of the recess in the base and the bottom of said recess be coated with a layer of an elastic material capable of compensating for the deformation of the medium filling the recess that is liable to arise during the medium solidification.
  • the intermediate link be made essentially as a pair of T-shaped beams, the vertical stem of each of the beams during the course of the table orienting being in a continuous sliding contact with the buttend surface of the base through the action of a springloaded plate provided on the base, and being positively forced against the surface during the cutting process, while on the flange of each of the beams an insert having a cylindrical recess is so located that the recess faces the surface of the table which carries cylindrical pins located on the table opposite sides in a correspondence with the beams and in parallel with the base, the pins with their lower portions entering said cylindrical recesses with a possibility of being in a continuous sliding contact therewith in the course of the table orienting; the upper portions of the pins carrying rockers which bear spring-loaded plates adapted to positively force the beam flanges through the inserts against the respective table pins during the course of cutting.
  • Such a constructional feature ensures quick action of the device for positive locking of the table.
  • the surfaces of the T-shaped beams and of the inserts which are in a continuous sliding contact with each other and with the respective base and table surfaces in the course of the table orienting, are provided with grooves adapted to form together with the surfaces of the mating surfaces leakproof channels communicating with the source of pressure-fed oil.
  • Such a constructional feature is conducive to practically minimizing forces of friction on the sliding surfaces of the mating parts and ensures a high accuracy of positioning the table carrying the workpiece during machining with respect to the cutting tool.
  • the proposed metal-cutting machine due to a simple constructional embodiment of the device for effecting a positive table locking in a predetermined position with respect to the cutting tool, ensures high table rigidity during the cutting process, features reliability in operation and convenience in servicing.
  • FIG. 1 is a general diagrammatic view of a metalcutting machine, according to the invention showing the table orientation mechanisms covered with protective bellows, with a portion thereof broken away;
  • FIG. 2 is a section taken along the line ll ll of FIG.
  • FIG. 3 illustrates the mutual arrangement of the table orientation mechanisms and the device for positively locking the table during the course of cutting, according to one of the embodiments of the present invention, with a fragmentarily cut-away view taken along the longitudinal plane of symmetry of the machine;
  • FIG. 4 illustrates the mutual arrangement of the table orientation mechanisms and the device for positive locking thereof during the course of cutting, according to another embodiment of the present invention, with a fragmenarily cut-away view taken along the longitudinal plane of symmetry of the machine and with another portion of the protective bellows broken away;
  • FIG. 5 is the table positive locking device of FIG. 1 as viewed from the butt end of the metal-cutting machine of the invention, with a fragmentarily cut-away view taken along the plane of symmetry;
  • FIG. 6 is an enlarged-scale sectional view taken along the line VlVI of FIG. 5.
  • the proposed metalcutting machine for machining locating surfaces comprises a table 1 for accommodating a workpiece 2 during machining, said table being mounted on a base 3 so as to have at least two degrees of freedom with respect thereto for an optimum positioning of the workpiece 2 with respect to a cutting tool A by means of at least two table orientation mechanisms, determined by the number of the degrees of freedom of the table, the mechanisms being located on the base one upon the other so as to form a consecutive kinematic chain having the terminal link interconnected with the table, and a device for positively locking the table 1 in a predetermined position with respect to the cutting tool A.
  • the device for the table positive locking comprises an intermediate link floating" in the base 3 and adapted for a continuous sliding contact with a surface B of the table 1 facing the base 3 during the course of the table orienting with respect to the cutting tool A, and means for positively connecting the intermediate link simultaneously to the table 1 and to the base 3 during the course of cutting.
  • the base 3 is located on a bed 4 of the machine.
  • the workpiece 2 being machined is in fact a turbine blade, wherein subject to machining as locating surfaces are two mutually perpendicular surfaces on the root and the central tapered hole at the blade end opposite to the root.
  • milling cutters 5 and 6 which are respectively located on milling heads 7 and 8 which are mounted by a conventional way on the bed 4, and a drill 9 held in a drill head 10 which is similarly mounted on the bed 4.
  • the turbine blade 2 is clamped on the table 1 by means of clamping fixtures 11 and 12.
  • the bed 4 mounts actuated holders 13 and 14 for a blade position sensor 15.
  • the table 1 has five degrees of freedom with respect to the base 3 due to the provision of five table orientation mechanisms.
  • these mechanisms are covered with bellows 16 protecting them from the ingress of alien bodies, such as metallic chips or cutting fluid.
  • the base 3 has arcuate rolling-contact ways 17 whose axis coincides with the axis Z of the coordinates.
  • the ways mount a rocking bar 18 which carries a streight rolling-contact ways 19 arranged in parallel to the axis Z of the coordinates and mounting a slide block 20.
  • the latter is provided with arcuate rolling-contact ways 21 whose axis coincides with the X of coordinates and wherein a cradle 22 is mounted.
  • a cylindrical cavity is provided lengthwise the axis Y of the coordinates, wherein a rod 23 is accommodated which with one of its ends is fixed in position on the surface B of the table 1, and with the other end rests against a rod 24 of a drive 25 to impart translational motion to the table 1 length-wise the axis Y, and against a relief spring 26, both the rod and the spring being located at the bottom of the cradle cylindrical cavity.
  • the table 1 has five degrees of freedom with respect to the axes XYZ of coordinates, viz., translational motion along the axes Z and Y effected respectively through the slide block 20 and the rod 23; rotary motion about the axes Z, X and Y carried out respectively through the rocking bar 18, the cradle 22 and the rod 23.
  • the drives of all the five table motions are selfcontained ones and are not shown in the appended drawings (except for the drive 25) with a view not to obscure the essence of the invention, and to sophisticate the drawings.
  • the extent of each of the travels of the table 1 is substantially proximate to the amount of the distributed machining allowance on the workpiece being machined.
  • two opposite sides of the table 1 have T-shaped shoulders 27 located on the surface B facing the base 3, whereas the latter is provided with respective recesses 28 for a free accommodation of said shoulders and for filling with a medium C capable of being in a liquid state during the table orienting with respect to the cutting tool, and in a solid state so as to firmly engage the base 3 and at the same time to rigidly embrace the shoulders 27 of the table 1 during the course of cutting.
  • the T-shaped shoulder may be made, according to the invention, along the entire periphery of the table 1 on its surface B, and the recess in the base 3 corresponding to such a shoulder in this case is made as a circular groove.
  • Such a constructional feature ensures a high degree of rigidity of the table that carries the workpiece during machining, and during the course of cutting.
  • the medium C for filling the recess 28 in the base 3 is expediently low-melting Woods alloy.
  • Woods alloy and water being capable of expanding upon solidifying, they firmly engage the base and embrace the shoulders, i.e are positively lockedin with both the same and the table, which is highly ad vantageous to ensure rather high table rigidity during the course of cutting.
  • channels 29 are provided in the base 3 proximate the contour of the recess 28, the channels being adapted to alternatively communicate with the source of heat or of cold during the course of orientation of the table 1 and during the cutting process, respectively.
  • a portion 30 of the shoulder 27 which faces the bottom of the recess 28 in the base 3, and the bottom of the recess be coated with a layer 31 of an elastic material capable of compensating for the deformation of the medium filling the recess arising during the course of its solidification, so as to preclude any displacement of the table with respect to the base at the moment of a positive locking therof in a predetermined position with respect to the cutting tool.
  • Spongy rubber may satisfactorily serve as such a material.
  • the proposed metal-cutting machine operates as follows.
  • the latter Prior to starting the operation of the machine, the latter is to be set up and adjusted as against the master pattern which substantially imitates the workpiece 2, viz., turbine blade machined on the machine.
  • the master pattern is set on the table I and clamped in the clamping fixtures l1 and 12 (FIG. 1). All the table orientation mechanisms are set in their middle positions so that each of the mechanisms are thus capable of imparting to the table 1 motion in both directions away from its central position.
  • the table 1 is positively locked with respect to the base 3.
  • theh channels 29 (FIG. 3) are made up so as to communicate with the source of cold, with the result that Woods alloy (or water) confined in the recesses 28, solidifies (gets crystallized), thus firmly holding the base 3 and simultaneously embracing the shoulders 27.
  • the cutting tool A (FIGS. 1 and 2), viz., the milling cutters 5, 6 and the drill 9 are brought towards the locating surfaces to be machined, the position of the cutting tools being fixed upon coming into contact with the locating surfaces.
  • the position sensors 15 Moved then toward to those surfaces of the master pattern on which'the imitated workpiece is to have a uniform allowance for subsequent machining, are the position sensors 15, this being effected by means of actuated holders 13 and 14 (FIG. 2) resting against the appropriate faces of the projection a (the latter is provided on the machine stationary member).
  • the tracers of the sensors 15 are set in their central position which is fixed either visually by the operator or is remembered by any of presently known electronic control systems suitable for the purpose.
  • the sensors 15 are retracted, and the master pattern is released from the clamping fixtures, whereupon the workpiece to be machined, viz., the turbine blade 2, is set instead of the master pattern, and the sensors 15 are approached to the appropriate surfaces thereof.
  • the sensor holders 13 and 14 resting against the respective faces of the projection a the sensor tracers assume the positions corresponding to the amount of machining allowance at every point to be checked on the surfaces of the workpiece 2.
  • the channels 29 (FIG. 3) are made to communicate with the source of heat, and the medium C contained in the recesses 28 of the base 3 melts, with the result that the shoulders 27 get released” and the table 1 is rendered free to be imparted motions transmitted thereto by the orientation mechanisms, with respect to the base 3.
  • the readings of the sensors 15 To provide as uniform distribution of the allowance at the points of the turbine blade being checked as positive, i.e., to approximate, as far as the actual shape of the given specific turbine blade permits, the readings of the sensors 15 to a single value; these initial readings that hold true for the given particular turbine blade are evaluated by the operator (or the machine electronic control system) by comparing with the readings of same sensors 15 taken when their traces assumes the central position while in touch with the checked surfaces of the master pattern.
  • the initial readings of the sensors 15 which are effective for the given blade, are compared with each other.
  • the rocking bar 18 In order to turn the blade 2 about the axis Z, the rocking bar 18 is traversed along the arcuate ways 17. Along with the rocking bar 18, also the slide block 20, the cradle 22 with the rod 23 carrying the table I together with the blade 2 fixed thereon by means of the clamping fixtures 11 and 12, are turned about the axis Z. To move the blade 2 along the axis Z, the slide block 20 is traversed along the straight ways 1?. When the cradle 22 travels along the arcuate ways 21 the blade 2 turns around the axis X.
  • the rod 23 serves which is imparted translational motion parallel to the axis Y of coordinate, this motion being transmitted thereto from the drive 25 via the rod 24.
  • the spring 26 is provided to counterbalance part of the mass of the rod carrying the table I and the other related parts.
  • another drive (not shown) by means of which the table 1 along with the blade 2 clamped thereon, turns on the rod 23 whose axis coincides with the axis Y of coordinates.
  • the table 1 When the optimum position for the blade 2 is determined, the table 1 is positively locked in that position, for which purpose the channels 29 get communicated with the source of cold. As a result of cooling the medium C contained in the recesses 28 congeals (gets crystallized) to firmly hold the base 3 and embrace the T-shaped shoulders 27 of the table, thus dependadly precluding any displacement of the table 1 with respect to the base 3.
  • the layers 31 of an elastic material that coat the butt surface of the shoulder and the bottom of the recess are capable of taking up the strain of the medium C filling the recess, arising at the moment of its crystallization, thereby precluding the effect of said forces upon the butt surface of the shoulder and upon the bottom of the recess.
  • Those forces that acts upon the other wetted surfaces of the shoulder and base are distributed symmetrically relative to the geometrical axis of the shoulder and thus are mutually balanced.
  • the T-shape is imparted to the shoulder 27 of the table with a view to preventing its escaping from the medium upon coagulation of the latter in the recess 28.
  • the devices for table positive locking with respect to the cutting tool due to the positive connection of the table 1 to the base 3, ensure high accuracy of fixing the table 1 along with the workpiece 2 with respect to the cutting tool A and high ridigity of the table 1, with the cutting forces acting upon the workpiece being machined, applied to the table 1 and therefrom to the base 3. Since the table and base are sufficiently rigid, the cutting forces are not taken up by the precision parts of the table orientation mechanisms, which contributes to the reliability and durability of the machine.
  • the device for a positive locking of the table 1 in a predetermined position with respect to the cutting tool A may be made, according to the invention, as follows.
  • the intermediate link is made essentially as a pair of the T-shaped beams 32 (FIG. 4) the vertical portion 33 (stem) of each of the beams, during the orientation of the table 1, being in a continuous sliding contact with the butt surface D of the base 3 by way of the springloaded plate 34 (FIGS. 4, 5, 6) mounted on the base, and is positively forced against said surface in the course of cutting.
  • each beam Located on the horizontal portion 37 (FIGS. 4, 5, 6) (flange) of each beam is the insert 38 having the cylindrical recess 39 so that said recess faces the surface B (FIGS. 4 and 5) of the table 1, wherein the cylindrical pins 40 are held on the opposite sides thereof respectively to the beams and parallel to the base 3, said pins with their bottom portions 41 (FIG. 6) being accommodated in said recesses of the inserts with a possibility of a continuous sliding contact therewith in the course of the table orientation.
  • the top portions 42 of the pins mount the rockers 43 (FIGS.
  • the insert 38 is during a direct sliding contact (in the course of the table orientation) by its bottom surface, with the beam flange 37, and by the surface of the cylindrical recess, with the bottom portion 41 of the pin 40.
  • a positive forcing of the stem 33 of each T-shaped beam 32 against the butt surface D of the base 3, and of the flange 37 of the beams through the insert 38 against the pin 40 is effected through the use of the diaphragm-actuated hydraulic clamps 47 and 48 (FIG. 6) mounted on the respective plates 34 and 44.
  • Each of the hydraulic clamps 47 and 48 is formed by the dish-shaped metallic diaphragm 49 adapted to tightly close the respective boring made in the plates 34 and 44 on the side facing, respectively, the stem 33 and the flange 37 of the beam, thus establishing leakproof spaces communicating with the source of pressure through the channels 50 and 51 (FIG. 4).
  • the table orientation mechanisms receive respective motions from their own drives. In this case no excess pressure occurs in the chambers of the hydraulic clamps 47 and 48, i.e., the clearances E and G (FIG. 6) are not taken up.
  • the beam 32 slips over the surface D of the base, while moving translationally in parallel therewith.
  • the beam 32 slips over the surface D of the base, while rotating about the axis X.
  • the beam 32 performs vertical translational motion, while sliding over the surface D of the base.
  • the beam 32 With the table 1 turning on the rod 23 about the axis Y, the beam 32 performs translational motion parallel to the base, while sliding over the surface D of the base. At the same time the pin 40 along with the table 1 describes an arc whose pivotal centre lies on the axis Y. While so moving, the pin entrains the insert 38 so as to perform a rotary motion on the surface of the flange 37 of the beam 32, the latter of which moves translationally.
  • the above-considered device for effecting the table positive locking does not impede any motion imparted to the table by the mechanisms for its orientation, while its intermediate link floating in the base, viz., a pair of the T-shaped beams 32 is in a continuous sliding contact both with the table 1 and with the base 3.
  • the feed of oil along the channels 52, 53, 54, 55 and 56 is terminated, and a pressure is established in the chambers of the hydraulic clamps 47 and 48 by communicating the latter with the source of pressure via the channels 50 and 51.
  • the metallic diaphragm 49 are bulges outwards to take up the clearances E and G, thus making the plates 34 and 44 heavily bear against the respective heads of the screw 36 and 46 (with a force of scores of tons) and forcing respectively the stem 33 of the beam 32 against the surface D of the base, and the flange 37 via the insert 38 against the bottom portion 41 of the pin 40, while at the same time resting with the rocker 43 against the top portion 42 of the pin 40.
  • diaphragm-actuated hydraulic clamps makes it possible to reliably ensure a simultaneous forcing of the stem and flange of the beam 32 against the respective surfaces of the base and table, at the same time attaining a minimum table displacement relative to the base due to an appropriately selected thickness of the metallic diaphragm 49.
  • Such a constructional feature adopted in the proposed machine ensures high-speed action, precision ac curacy of the table locking in a predetermined position with respect to the cutting tool, high rigidity of the table-to-base connection in the course of cutting which,
  • the proposed machine may be effectively employed for machining locating surfaces of intricate-shape workpieces having a minimum possible machining allowance (down to 0.3 mm) on curvilinear surfaces subject to further machining.
  • a metal-cutting machine for machining locating surfaces comprising: a bed; a base mounted on said bed; a table for accommodating the workpiece under machining, said table being mounted on said base and having at least two degrees of freedom with respect thereto for an optimum positioning of said workpiece with respect to the cutting tool; a means carrying said cutting tool, mounted on said bed of the machine; at least two table orientation mechanisms whose number depends upon the number of the degrees of freedom of the table, said mechanisms being arranged one upon the other to form a common kinematic chain having the terminal link interconnected with said table carrying the workpiece being machined; a device for a positive locking of said table in a predetermined position with respect to said cutting tool, including an intermediate link floating in said base and adapted for a continuous sliding contact with the surface of said table facing said base in the course of the table orienting with respect to said cutting tool; said intermediate link being made as a pair of T-shaped beams, the vertical portion of each of said beams being, during the orientation of said table, in a
  • each T-shaped beam is positively forced against the butt surface of the base and the flange of each T-shaped beam is positively forced through the insert against the pin by virtue of diaphragm-actuated hydraulic clamps mounted on the res pective of said plates,

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Machine Tool Units (AREA)
US304825A 1972-10-18 1972-11-08 Metal-cutting machine for machining locating surfaces Expired - Lifetime US3884122A (en)

Priority Applications (6)

Application Number Priority Date Filing Date Title
AT892172A AT325377B (de) 1972-10-18 1972-10-18 Drehbarer arbeitstisch für werkzeugmaschinen
GB4838872A GB1384804A (sv) 1972-10-18 1972-10-20
CH1556472A CH574301A5 (sv) 1972-10-18 1972-10-25
DE2252515A DE2252515C3 (de) 1972-10-18 1972-10-26 Werkstückaufspanntisch
US304825A US3884122A (en) 1972-10-18 1972-11-08 Metal-cutting machine for machining locating surfaces
FR7244815A FR2210483B1 (sv) 1972-10-18 1972-12-15

Applications Claiming Priority (6)

Application Number Priority Date Filing Date Title
AT892172A AT325377B (de) 1972-10-18 1972-10-18 Drehbarer arbeitstisch für werkzeugmaschinen
GB4838872A GB1384804A (sv) 1972-10-18 1972-10-20
CH1556472A CH574301A5 (sv) 1972-10-18 1972-10-25
DE2252515A DE2252515C3 (de) 1972-10-18 1972-10-26 Werkstückaufspanntisch
US304825A US3884122A (en) 1972-10-18 1972-11-08 Metal-cutting machine for machining locating surfaces
FR7244815A FR2210483B1 (sv) 1972-10-18 1972-12-15

Publications (1)

Publication Number Publication Date
US3884122A true US3884122A (en) 1975-05-20

Family

ID=27542502

Family Applications (1)

Application Number Title Priority Date Filing Date
US304825A Expired - Lifetime US3884122A (en) 1972-10-18 1972-11-08 Metal-cutting machine for machining locating surfaces

Country Status (6)

Country Link
US (1) US3884122A (sv)
AT (1) AT325377B (sv)
CH (1) CH574301A5 (sv)
DE (1) DE2252515C3 (sv)
FR (1) FR2210483B1 (sv)
GB (1) GB1384804A (sv)

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4024673A (en) * 1975-06-25 1977-05-24 Cnmp Berthiez Machines with a circular blank-holder spindle
US4613262A (en) * 1984-12-28 1986-09-23 The Boeing Company Drill motor assembly with gimbal normality and clamp-up capability
US4926602A (en) * 1989-07-27 1990-05-22 Crouch Robert H Edge sander having adjustable support table or tables
US5168608A (en) * 1990-01-10 1992-12-08 Refurbished Turbine Components Limited Apparatus for the repair of turbine blades
EP0558877A1 (en) * 1992-03-03 1993-09-08 OFFICINE MECCANICHE VARINELLI S.p.A. A support and positioning device for the vertical broaching of bladed-rotor disks
US20050186045A1 (en) * 2002-01-31 2005-08-25 Franz Killer Method and apparatus for machining a blank from all directions in a machine tool or milling machine
US20050191140A1 (en) * 2002-01-31 2005-09-01 Franz Killer Method and apparatus for machining a blank from all directions
US10864585B2 (en) 2017-03-13 2020-12-15 General Electric Company Machining system for turbomachine dovetail

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3267772A (en) * 1964-04-23 1966-08-23 Houdaille Industries Inc Quick positioning table

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3267772A (en) * 1964-04-23 1966-08-23 Houdaille Industries Inc Quick positioning table

Cited By (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4024673A (en) * 1975-06-25 1977-05-24 Cnmp Berthiez Machines with a circular blank-holder spindle
US4613262A (en) * 1984-12-28 1986-09-23 The Boeing Company Drill motor assembly with gimbal normality and clamp-up capability
US4926602A (en) * 1989-07-27 1990-05-22 Crouch Robert H Edge sander having adjustable support table or tables
US5168608A (en) * 1990-01-10 1992-12-08 Refurbished Turbine Components Limited Apparatus for the repair of turbine blades
EP0558877A1 (en) * 1992-03-03 1993-09-08 OFFICINE MECCANICHE VARINELLI S.p.A. A support and positioning device for the vertical broaching of bladed-rotor disks
US20050186045A1 (en) * 2002-01-31 2005-08-25 Franz Killer Method and apparatus for machining a blank from all directions in a machine tool or milling machine
US20050191140A1 (en) * 2002-01-31 2005-09-01 Franz Killer Method and apparatus for machining a blank from all directions
US7112017B2 (en) * 2002-01-31 2006-09-26 Alstom Technology Ltd Method and apparatus for machining a blank from all directions
US7261500B2 (en) * 2002-01-31 2007-08-28 Alstom Technology Ltd Method and apparatus for machining a blank from all directions in a machine tool or milling machine
US10864585B2 (en) 2017-03-13 2020-12-15 General Electric Company Machining system for turbomachine dovetail

Also Published As

Publication number Publication date
DE2252515C3 (de) 1975-10-02
CH574301A5 (sv) 1976-04-15
AT325377B (de) 1975-10-27
DE2252515A1 (de) 1974-05-09
FR2210483A1 (sv) 1974-07-12
GB1384804A (sv) 1975-02-19
DE2252515B2 (de) 1975-02-20
FR2210483B1 (sv) 1977-07-22

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